MACHINERY | DIE DEVELOPMENTS
Right: Guill’s Micro Medical is an extrusion crosshead that can be precisely adjusted
IMAGE: GUILL
date distortion accurately. Very recently, Plastic Flow has also updated its software to further improve the speed and accuracy of post-die extrudate shape
prediction. “The algorithm for prediction
of extrudate shape distortion has been updated to further improve its accuracy,” said Gupta. “In particular, the algorithm for estimating the transi- tion of molten polymer into a solid plastic has been revamped.” The new algorithm takes into account the maximum thickness of the extruded profile at the die exit to accurately estimate the fluid to solid transition, said Gupta. Other refinements include allowing multiple
temperature zones on die walls, and an improved user interface.
Medical precision US-based Guill Tool & Engineering says that its Micro Medical is an extrusion crosshead that uses micro-fine adjustment screws for precise adjust- ment of concentricity. This single point concentricity adjustment is used for the extrusion of thin-walled and precision medical tubing. A single adjustment bolt controls 360° of adjustment. Features include: a patented cam-lock deflector for quick changeovers, with a residence time of one minute at 0.5 lbs/hr material flow, optimised usage with extruders measuring 0.5 and 0.75in,
and a maximum die internal diameter of 0.25in. In addition, it offers high flexibility: it accepts both both vacuum and micro-air accessories, and is ideal for pressure and sleeving applications, says the company.
PVC die heads Austria-based Conextru says that its PV range of PVC pipe heads comprises seven products, covering the range of 10-800mm in diameter and 1.0-38.1mm wall thicknesses. The main features of the pipe heads include: a
broad outer diameter range for each size; PN 16 pressure class for each head – which requires high compression thick pipes, and a well-designed torpedo with compression ratios higher than 5; and, a wide range of residence times – from 3 to a maximum of 15 minutes.
Die sets can also be used on a head that is of a
larger size. For instance, PV 250 die sets (110- 250mm) can be used on PV 400 through the use of a range adapter, while PV 400 die sets (250- 400mm) can be used on a PV 630.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.kraussmaffei.com �
www.maillefer.net �
www.battenfeld-cincinnati.com �
www.greinerextrusion.com �
www.nimbus.com �
www.tue.nl/en �
www.plasticflow.com �
www.deceuninck.com �
www.guill.com �
www.conextru.eu
www.beierpm.com
www.beierextrusion.com
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